When using Spring 3.0.5 MVC development, JSON interface data development, using JSONObject.fromobObject (Object) to return JSON data. Problems with “org. Springframework. Web. HttpMediaTypeNotAcceptableException: Could not find acceptable representation” error.
Solution 1:
The @responseBody method’s return type is changed from JSONObject to Object.
Modify SpringMVC-servlet.xml to add MessageConverters
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<!-- Object->json -->
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</list>
</property>
</bean>
JacksonJar package support is required: jackson-core-lgpl-1.2.1.jar and jackson-core-lgpl-1.2.1.jar.
Solution 2:
The @responseBody method returns a String instead of a JSONObject, and returns JSONObject.fromobObject (Object).toString();
At this time, if there is Chinese, there will be garbled code, the solution is as follows:
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<!-- Object->json -->
<!-- <property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</list>
</property> -->
<!-- default is ISO you should set utf-8 -->
<property name="messageConverters">
<list>
<bean
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="text" />
<constructor-arg index="1" value="plain" />
<constructor-arg index="2" value="UTF-8" />
</bean>
</list>
</property>
</bean>
</list>
</property>
</bean>
Solution 3:
The return type is JSONObject. Write your own Converter.
package javacommon.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.nio.charset.Charset;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
public class JaksonConverter extends AbstractHttpMessageConverter<Object> {
public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
public JaksonConverter() {
super(new MediaType("application", "json", DEFAULT_CHARSET));
}
@Override
protected boolean supports(Class<?> clazz) {
// TODO Auto-generated method stub
return false;
}
@Override
protected Object readInternal(Class<?extends Object> clazz,
HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
logger.info(clazz.getSimpleName());
InputStream inputStream=inputMessage.getBody();
StringBuilder stringBuilder = new StringBuilder();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String line = null;
while((line = bufferedReader.readLine()) != null){
stringBuilder.append(line);
}
logger.info(stringBuilder.toString());
return stringBuilder;
}
@Override
protected void writeInternal(Object t, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
logger.info(t.getClass().getSimpleName());
// HashMap
// JSONObject
logger.info(t.toString());
OutputStream os=outputMessage.getBody();
os.write(t.toString().getBytes("utf-8"));
os.flush();
}
}
Replace the Converter in Scenario 1 with a written one.